Respiratory mask



FIG. 1 is a front elevational view of a respiratory mask.

FIG. 2 is a rear elevational view of the respiratory mask shown in FIG. 1.

FIG. 3 is a top plan view of the respiratory mask shown in FIG. 1.

FIG. 4 is a bottom plan view of the respiratory mask shown in FIG. 1.

FIG. 5 is a side elevational view from the right side of the respiratory mask shown in FIG. 1.

FIG. 6 is a perspective view from the front and right side of the respiratory mask shown in FIG. 1.

FIG. 7 is a perspective view from the rear and right side of the respiratory mask shown in FIG. 1; and,

FIG. 8 is a side elevational view from the left side of the respiratory mask shown in FIG. 1.

The broken line showings in FIGS. 1, 2, and 7 illustrate a portion of the article and form no part of the claimed design. 

CLAIM The ornamental design for a respiratory mask, as shown and described. 